Heat exchanger



M. H.-HoFME1s'rER Nov. 24, 1953 HEAT EXCHANGER Filed Nov. 29, 1949 f IIIIIIIlM//f Patented Nov. 24, 1953 Maurice H. Hofmeister, Bell & Gossett Com Evanston, Ill., assigner to Dany a corporation of Illinois Application November 29, 1949, Serial No. 130,000 4 Claims. (Cl. 257-230) My invention relates to heat exchangers and more particularly to an arrangement of this character including' coils that are specially 'related for insertion through `the wall oi' a steam or hot water boiler, or other kind of shell.

To provide a source of hot water, it is common practice to insert a' heating coil through the Wall of a boiler for exposure to hot water or steam as the case may be. For adequate heat transfer, it is necessary that a considerable length of tubing be employed to make the coil and, since flue passages within the boiler materially reduce the space available for installation and it is undesirable to make a single opening in the 'boiler wall to receive the coil because such an opening would so reduce the structural strength of the boiler that internal staying would be required, itis customary .to form the coil in two or more, usually three, loops or banks which are inserted through a like number of spaced openings inthe boiler wall. The openings are covered by a plate through which the inlet and outlet endsof the coil extend for connection to the system being serviced, but it is necessary to provide external, U-shaped pipe sections which are brazed to and provide connection between the adjacent ends of the loops which also project through the plate. This type of connection is unsightly, uneconomical to manufacture, and creates future points of leakage.

It is therefore one object of the invention to provide a heat exchanger of the general type indicated in which the only parts of the complete coil which extend through the cover plate are the inlet and outlet ends thereof.

A further object is to provide a heat exchanger including a coil having a plurality of loop components arranged for insertion through a like number of openings in a boiler wall, the adjacent ends of the components being connected by return bends which are disposed between the boiler wall and a plate covering the openings. Q

A further object is to devise amounting for a heat exchanger coil composed of a plurality of loop components, the mounting consisting of a plate arranged to cover the openings through which the components extend into theassociated shell and the plate including a pocket for receiving the return bends that connect the adjacent ends of the loop components.

These and further objects of the invention will be set forth in the following specification, reference being had to the accompanying drawing, and

the novel means by which said objects are eifectuated, will be denitely pointed out in the claims.

In the drawing:

` capable of use with any type Morton Grove, Ill.,

Fig. l is a side elevation of a typical hot water boiler equipped with the heat exchanger. l Y

Fig. 2 is a plan view of the boiler.

Fig. 3 is an enlarged section along the line 3-'3 inFig. 1.

By Way of example, the invention will be described in connection with a Ihot water boiler, but it will be understood that'the coil mounting is of shell.

The numeral I 0 designates a characteristic hot water boiler which may be connected to a heat# ing system (not shown) by supply and return pipes II and I2, respectively, the boiler being cylindrical but may have other shapes. A plurality of vertically spaced openings I3,` I4 and I5 are cut in the side wall of the boiler, with portions of the boiler wall designated by the numerals I6 and II interveningbetween the openings I3 and I4 and the openings I4 and I5, respectively.v Preferably, the openings are elon` gatedin shape with their major dimensions extending horizontally of the boiler, but the openings may have other shapes depending upon the marginal 'outline of the loop component which is inserted through the opening. l

A plate I8 is attached to the boiler wall in enclosing relation to the openings I3, yIll and I5 and adjacent the bottom and top of the plate and forming a part thereof are hollow bosses I9 and 20 which register with the openings I3 and I5, all respectively. The plate is centrally offset outwardly from the boiler wall to provide a vertical pocket 2| which bridges across the opening I4, with the ends of the the openings I 3 and I5.

The exchanger coil 22 ends projecting throughthe bosses I 9` and 20,

respectively, while that part of the coil which extends within the boiler is,

in the present instance, arranged in a plurality of vertically spaced loops 23, 24 and 25 which are sized to Vber inserted through the openings I3, I4 and I5, respectively, parts of the coil indicated by the numerals 26 and 21 which connect the loops 23 and 24 and the loops 24 and 25 being located in the pocket 2| so that they extend around the wall portions I6 and I1, all respectively. In plan View, each loop may possess the flattened sinuous shape shown in Fig. 2, but the disclosure in this connectionis intended to be largely diagrammatic since the loops mayy be arranged as desired so long serted through its appropriate opening in the boiler wall. Y Further, the number of openings may be as low as two or any greater number depending upon operating requiremen .v n

The coil and plate may be separately Vaspocket communicating with has its nnet'and ouder as each may be in 3 sembled and installed as a unit in the boiler. Since only the inlet and outlet ends of the coil project through the plate, the number of openings therethrough, compared with present practice, is reduced. The parts of the tubing or pipe which connect the loops lie inwardly of the plate, thereby eliminating the present lexternal loop constructionwith its possibilities 'for leakage.

I claim:

l. In a heat exchanger, the combination of 'a shell having a plurality of spaced openingsin a Wall thereof, a continuous pipe coil comprisinga plurality of spaced loops eaehextendingw-freely through an associated opening `into-theshell, land a plate secured to the wall in covering relation to the openings and odset tn deiine withthe included part of the wall a pocket communieating through lthe openings with the interior fof-,the shell, the coil including pipe portions positioned inthe .pocket .and :seriallyflow connecting the i'ops andthe inie't and iitietgeuds of tiiec'ou extending through sfelected fopening's, `respectlglandtsh'ythiieh ille-.Plaie- A V V 2.A In a heat exchanger, "the 'co'mhinationo'fla vertical shell having a plurality. of .vertically spaced openingsin a side wall thereof,r aeontinudus 'pipe'.,coil comprising a plurality of 'generally Horizontal loops"spacedvertically 4to register-with andextending `freely through 'the openings, `repe'ctiv'ely, into the shell, and a plate secured to the ivalli'n covering 'relation 'to the openings and ov t along the 'vertical center line thereof to define with the includedpart ofthe Wall a vertical'elongated pocket communicating through the op nings with the 'interior of the-shell, the coil uding tferticall'yaligned, 4U'sha'r' ed, pipe portions 'positiorie'fd rin the pocket and serially flow connecting the loops and the 'inlet and outlet ends 'of the Ajcoil extending through selected rWall optr'iings, respectively, 'and tightly through the niet@ r Y Inja heatexchanger, the `cor'nuination of a shell'having a plurality of spaced openings in ,a Wall thereof, and 'an vassembly mounted ,as'a unit ornthershelll comprising a continuous pipe coil including a pluralityjof space dl'oops each extendispectively, and tightly through the plate in supported relation thereto.

4. VLIna heat exchanger having a shell provided y vvithapluralityoi spaced openings in a side wall thereof, `,the combination of a continuous pipe vcoil Ycomprising a plurality of spaced, parallel loops adapted to extend freely through the openings, respectively, Ainto the shell, and a plate adapted for securement to the wall in covering relation to the openings and offset to provide an elongated pocket knormal Lto 4the 1.loops land .Varfageid togermnicate uiiight iviththe 'interior'oifthe'shelhth y l alignediubends'positipned in'the qciet'fp any no'w connecting the loops "and @trie met and outlet ends ofthe 'een extending tightly `tii'roiigh and beingcarried hy the plate.

MAURICE n. References :cited in n'ejpie of ,this irate@ 'UNITED "sfr-Aires .ATNS 

